The world will need a lot more natural gas in the coming years.Natural gas demand is on track to grow sharply by 2030. The lower-carbon fuel is helping meet the accelerating demand for power in the U.S. and abroad, which is fueling robust and rising cash flows for natural gas-infrastructure operators, enabling them to pay attractive dividends and invest in expanding their operations. Kinder Morgan (KMI 4.13%) and Williams (WMB 2.04%) are two of the country's natural gas-infrastructure leaders. That makes th ...